KR102075638B1 - Manufacturing method of slurry for solid oxide fuel cell and slurry for solid oxide fuel cell manufactured thereby - Google Patents

Abstract

A method for producing a slurry for a solid oxide fuel cell and a slurry for a solid oxide fuel cell produced thereby are provided. Specifically, the process time can be shortened by preparing a slurry using resonance acoustic mixing, and the prepared slurry has a high dispersion and does not cause slurry agglomeration when the tape casting process is performed, and has a low surface roughness. It is possible to improve the quality of the battery employing it.

Description

A method for producing a slurry for a solid oxide fuel cell and a slurry for a solid oxide fuel cell manufactured by the same, and a slurry for the solid oxide fuel cell manufactured by the same.

The present invention relates to a method for producing a slurry for a solid oxide fuel cell and a slurry for a solid oxide fuel cell prepared by the same, and more specifically, to shortening a process time and dispersing a slurry by using resonance acoustic mixing (RAM). The present invention relates to a method for preparing a slurry for a solid oxide fuel cell and a slurry for a solid oxide fuel cell prepared thereby.

Solid Oxide Fuel Cell (SOFC) is an environmentally friendly energy source that can significantly reduce carbon dioxide emissions compared to conventional batteries by using solid oxides with oxygen or hydrogen ion conductivity as electrolytes. Have In general, a solid oxide fuel cell has a structure in which a cathode and an anode are disposed on both sides of a solid electrolyte and the solid electrolyte. Specifically, the solid oxide fuel cell generates oxygen ions while the air is electrochemically reduced in the cathode, and the oxygen ions are delivered to the anode through the solid electrolyte and combined with fuel injected into the anode to oxidize electrochemically. The electrons are released and electricity is generated as the electrons move along the external circuit.

The anode of a solid oxide fuel cell has a microstructure of a porous layer mainly for improving electrochemical activity and electrical conductivity through expansion of reaction area and reduction of concentration in the process of oxidizing hydrogen to hydrogen ions. Thus, conventionally, when manufacturing a solid oxide fuel cell, a method of preparing the anode in a pellet form and disposing the electrolyte by dipping or spray coating has been used, but the anode and the electrolyte having a porous structure are used. It is difficult to control the shrinkage ratio of the crack and peeling phenomenon appears. Therefore, a method of preparing a dense electrolyte layer by stacking and stacking a sheet-type anode support and an electrolyte slurry in a sheet form by using a tape casting method has been widely used.

However, the ball milling process or the basket milling process performed during the slurry production can be uniformly mixed, but there is a problem that the process takes more than 72 hours and needs improvement.

Republic of Korea Registration No. 10-1222867

In order to solve the above problems, the present invention is to provide a method for producing a slurry for a solid oxide fuel cell that can shorten the slurry manufacturing process time, and to provide a slurry for a solid oxide fuel cell produced thereby.

In order to solve the above problems, an aspect of the present invention includes preparing a slurry by mixing a raw material powder, a solvent including a dispersant, a binder, and a plasticizer, and the mixing process is performed using resonance acoustic mixing. It is possible to provide a method for producing a slurry for a solid oxide fuel cell.

The raw material powder includes at least one oxide powder selected from zirconia (Zr), ceria (Ce), lanthanum (La) magnesite (Mn), and bismuth (Bi), metal oxide including nickel (Ni) oxide It may be one containing a powder and a pore former.

Before performing the mixing process, the method may further comprise the step of preparing by mixing each of the raw material powder and the solvent containing the dispersant using a resonance acoustic mixing.

The mixing step is a first mixing step of mixing the raw material powder and the solvent containing the dispersant to form a first mixture, the second adding the binder to the first mixture, and then mixing to form a second mixture After the addition of the plasticizer to the mixing step and the second mixture, it may include a third mixing step of mixing to form the slurry.

The mixing step may further include adding a grinding ball to at least one mixing step of the first mixing step, the second mixing step, and the third mixing step to mix.

The resonance acoustic mixing may be to perform a mixing process with an acceleration of 60 to 80 G.

The resonance acoustic mixing may be to perform a mixing process for a time of 3 to 60 minutes with an acceleration of 80 G.

Another aspect of the present invention can provide a slurry for a solid oxide fuel cell, which is prepared by mixing a raw material powder, a solvent including a dispersant, a binder, and a plasticizer using resonance acoustic mixing.

The method for producing a slurry for a solid oxide fuel cell using resonance acoustic mixing of the present invention can significantly shorten a manufacturing process time than a slurry manufacturing method using a conventional ball milling process.

In addition, since the slurry for the solid oxide fuel cell manufactured by the above method is uniformly crushed and dispersed, agglomeration of the slurry does not occur in the tape casting process and thus may be easily utilized.

In addition, the slurry for the solid oxide fuel cell prepared by the above method can lower the surface roughness by uniform mixing, thereby improving the quality of the battery employing the same.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a flowchart illustrating a method of manufacturing a slurry for a solid oxide fuel cell according to an embodiment of the present invention.
2A to 2C are images of the slurry prepared in Examples 1, 2, and 3 according to one embodiment of the present invention, dried after tape casting, and observed from the tape surface. .
3 is a SEM image showing the surface of the slurry prepared in Comparative Example 1 and Example 1 of the present invention by attaching to the surface of the tape to observe the surface with a scanning electron microscope.
4 is a SEM image showing the surface of the slurry prepared in Comparative Examples 1 and 4 of the present invention by scanning electron microscope.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While the invention allows for various modifications and variations, specific embodiments thereof are illustrated by way of example in the drawings and will be described in detail below. However, it is not intended to be exhaustive or to limit the invention to the precise forms disclosed, but rather the invention includes all modifications, equivalents, and alternatives consistent with the spirit of the invention as defined by the claims. Like reference numerals denote like elements throughout the specification.

One aspect of the present invention includes a step of preparing a slurry by mixing a raw material powder, a solvent including a dispersant, a binder, and a plasticizer, wherein the mixing process is performed using resonance acoustic mixing. It is possible to provide a method for producing a slurry.

Specifically, the resonance acoustic mixing may be a method of dispersing or crushing the particles of the mixture by using the principle of acoustic resonance. More specifically, the mixture may be induced into an acoustic resonance state by using a natural resonant acoustic frequency capable of miniaturizing the particle size constituting the mixture. In this case, the acoustic energy including the resonant acoustic frequency may be accumulated inside the particles constituting the mixture to disperse the particles in the structure or the surrounding medium. Thus, according to the present invention, by performing the mixing process of the mixture constituting the slurry using the resonance acoustic mixing using the above-described principle, it is possible to increase the degree of crushing and dispersion of the macroparticles and aggregated particles produced in the mixing process, uniform One mixing can improve the quality of the slurry.

In one embodiment of the present invention, the resonance acoustic mixing may use a conventional resonance acoustic mixing apparatus, the resonance acoustic mixing apparatus may be provided with a transducer for converting the injected electromagnetic energy into physical vibration and acoustic energy. .

The type of the raw material powder may vary depending on the use of the slurry for the solid oxide fuel cell. Specifically, when the slurry for the solid oxide fuel cell is used to manufacture a solid electrolyte layer, the raw material powder may include a powder for forming a solid electrolyte. Specifically, for example, the solid electrolyte formation powder may include Yttria Stabilized Zirconia (YSZ: (Y ₂ O ₃ ) _x (ZrO ₂ ) _1-x , x = 0.05 to 0.15) powder. It is not limited to this. Alternatively, when the slurry for the solid oxide fuel cell is used to manufacture the anode support layer, the raw material powder may include a powder for forming the anode support layer.

In one embodiment of the present invention, the solid oxide fuel cell slurry is to prepare a slurry for use in the production of the anode support layer, the raw material powder may be a powder for forming the anode support layer. Specifically, for example, the anode support layer forming powder may include a conductive metal oxide powder and a pore forming agent. The conductive metal oxide is at least selected from Ni, Zr, Ce, Ti, Mg, Al, Si, Mn, Fe, Co, Cu, Zn, Mo, Y, Nb, Sn, La, Ta, V, Bi and Nd It may be one or more compounds, but is not limited thereto.

In one embodiment of the present invention, the raw material powder is at least one oxide powder selected from zirconia (Zr), ceria (Ce), lanthanum (La) magnesite (Mn) and bismuth (Bi) -based, nickel It may be a metal oxide powder and a pore-forming agent containing (Ni) oxide. More specifically, the raw material powder may include yttria stabilized zirconia (YSZ) powder, nickel oxide (NiO) powder and a pore former.

The pore former may be one using a conventional material capable of forming a pore structure. Specifically, for example, the pore-forming agent is diethylglycol, polyethylene glycol, polyvinylpyrrolidone (PVP), polyvinylalcohol, and polymethylmethacrylate (polymethylmethacrylate). , PMMA) may be included, but is not limited thereto.

In the solvent including the dispersant, the solvent may be used for mixing the raw material powder, the dispersant, the binder and the plasticizer and the like and the fluidity control of the slurry composition comprising the same. Specifically, for example, the solvent is selected from ethanol, toluene, triethylene glycol ethyl ether, ethylene glycol hexyl ether, diethylene glycol ethyl ether, tripropylene glycol methyl ether, ethylene glycol (ethylene glycol) and xylene (xylene). At least one of which may include, but is not limited thereto.

In the solvent containing the said dispersing agent, a dispersing agent is used in order to improve the dispersibility in the solvent of the said raw material powder mixed with the said solvent, A normal dispersing agent can be used. Specifically, for example, the dispersing agent may include at least one selected from polyethylene glycol ether, alkyl sulfonate, polycarboxylate, phosphate ester, and hypermercade (Hypermer ™ KD), but is not limited thereto. Does not.

The binder may be to increase the adhesion between the raw material powder and the electrode layer or electrolyte layer in which the prepared slurry is to be disposed. Specifically, for example, the binder is polyvinylbutylyral (PVB), polyvinyl alcohol (polyvinylalcohol, PVA), polyvinylpyrrolidone, polyethylene glycol, xylene, polyethylene, polypropylene, polystyrene, polyvinyl chloride It may include, but is not limited to, at least one selected from the group consisting of lidene, polycarbonate, polyimide, and ethyl cellulose.

The plasticizer may be added to increase the processability and flexibility of the slurry composition to be produced. Specifically, for example, the plasticizer is dibutyl phthalate (DBP), di-2-ethylhexyl phthalate (DOP), diisononyl phthalate (DIP), diiso Choose from decylphthalate (DIDP), butyl benzyl phthalate (BPB), glycerol, ethylene glycol, polyethylene glycol, dioctyl phthalate, triphenyl phosphate, trioyl phosphate, polyethylene glycol dimethyl ether and dimethylformamide At least one of which may include, but is not limited thereto.

The slurry may be prepared by mixing the raw material powder, the solvent including the dispersant, the binder, and the plasticizer using a resonance mixing sound.

In one embodiment of the present invention, prior to performing the mixing process, may further comprise the step of preparing by mixing the solvent containing the raw material powder and the dispersant using resonance acoustic mixing, respectively. That is, before performing the mixing process, only the raw material powder may be prepared by mixing by resonance acoustic mixing. This may be intended to increase the mixing efficiency in the mixing process with the solvent by preparing by mixing the various raw materials contained in the raw material powder first. In addition, only the solvent containing the dispersant may be prepared by mixing by resonance acoustic mixing. This may be intended to increase the efficiency of mixing by uniformly dispersing the dispersant in the solvent to widen the contact range of the raw material powder and the dispersant when mixing the raw material powder. In one embodiment of the present invention, prior to performing the mixing process, the process of mixing the solvent containing the raw material powder and the dispersant using resonance acoustic mixing, respectively, 3 to 5 minutes each with an acceleration of 60 to 80 G It may be to carry out the mixing process for a time of minutes.

In one embodiment of the present invention, the mixing process performed in the step of forming a slurry by mixing the raw material powder, a solvent including a dispersant, a binder and a plasticizer, the additives included in the slurry composition are sequentially added according to the order of addition After that, the mixing process may be performed. Specifically, this is for the effective mixing and dispersing effect of the raw material powder, the solvent including the dispersant, the binder and the plasticizer included in the slurry, the present invention is a tape using a conventional slurry through this sequential mixing process It is possible to improve the agglomeration of the slurry on the tape surface during the casting process.

1 is a flowchart illustrating a mixing process of a method of manufacturing a slurry for a solid oxide fuel cell according to an embodiment of the present invention.

Referring to FIG. 1, first, a first mixing process of forming a first mixture by mixing a solvent including the raw material powder and the dispersant may be performed (S100). That is, after the solvent including the dispersant is added to the raw material powder, it may be mixed by resonance acoustic mixing to form a first mixture. Specifically, this may be for mixing the raw material powder and the dispersant included in the solvent in the solvent efficiently before adding and mixing the binder and the plasticizer, so that the binder and the plasticizer may be mixed to mix a large surface area. .

Then, after the binder is added to the first mixture mixed in step S100, a second mixing process of mixing and forming a second mixture may be performed (S200). That is, after the binder is added to the first mixture in which the raw material powder and the solvent including the dispersant are mixed, the binder may be mixed by resonance sound mixing to form a second mixture. As described above, the raw material powder, the solvent containing the dispersant may be first mixed and dispersed at a predetermined level, and then the binder may be added and mixed to improve the agglomeration of the prepared slurry.

Thereafter, after the plasticizer is added to the second mixture mixed in the step S200, a third mixing process of mixing and forming a slurry may be performed (S300). That is, the plasticizer may be added to the second mixture in which the raw material powder, the solvent including the dispersant, and the binder are mixed, and then mixed with a resonance sound mixing to form a slurry. Specifically, after mixing all the constituents constituting the slurry except the plasticizer, the plasticizer may be added and mixed to lower the surface roughness of the final product slurry than when the plasticizer is added together. In more detail, it can be described in detail through the following embodiments and drawings.

In one embodiment of the present invention, the mixing process using the resonance acoustic mixing is a grinding ball (ball) is added to at least one of the mixing process of the first mixing process, the second mixing process and the third mixing process It may further comprise the step of mixing. That is, when the above-described first mixing process, the second mixing process and the third mixing process are performed, the constituent particles included in each of the first mixture, the second mixture, and the third mixture are pulverized to make the mixing more uniform. Dragon balls can be added. Specifically, for example, the grinding ball may include at least one selected from zirconia balls, alumina balls, and stainless balls, but is not limited thereto. In one embodiment of the present invention, zirconia balls may be used as the grinding balls.

In one embodiment of the present invention, the resonance acoustic mixing may be to perform a mixing process with an acceleration of 60 to 80 G. If the acceleration applied to the mixture and additives included in the respective mixing process during the resonance acoustic mixing is less than 60 G, uniform mixing of the materials constituting the slurry may not be achieved, if the acceleration exceeds 80 G, The microstructure of the prepared slurry particles may be broken or deformed. Thus, resonance sound mixing can be performed within the above range.

In one embodiment of the present invention, the resonance acoustic mixing may be performed for a mixing process for a time of 3 to 60 minutes. When the mixing time of the resonance acoustic mixing is less than 3 minutes, sufficient mixing may not be achieved and the dispersion of the raw material powder may be lowered. When the mixing time of the resonance acoustic mixing exceeds 60 minutes, a certain range due to excessive crushing It can be difficult to obtain a slurry with a particle size of. Thus, resonance sound mixing can be performed within the above range.

According to an embodiment, after performing the mixing process using the resonance mixing sound, a process of de-airing the mixed slurry may be additionally performed. The defoaming step is to remove large and small bubbles that may be contained in the mixed slurry, it can be carried out using a conventional defoaming process method and degassing apparatus. In one embodiment of the present invention, the defoaming process may be performed for about 1 minute with an acceleration of 20G.

Another aspect of the present invention can provide a slurry for a solid oxide fuel cell, which is prepared by mixing a raw material powder, a solvent including a dispersant, a binder, and a plasticizer using resonance acoustic mixing. The raw material powder, the solvent including the dispersant, the binder and the plasticizer may refer to the description of the method of preparing the slurry for the solid oxide fuel cell described above.

Since the slurry for the solid oxide fuel cell is formed through more uniform mixing in a faster time than a conventional ball milling process using resonance acoustic mixing, it is possible to improve the agglomeration of slurry particles when using a slurry such as tape casting. In addition, the slurry for the solid oxide fuel cell may lower the surface roughness.

Specifically, the agglomeration of the slurry includes macroparticles, which means that additives including the raw powder contained in the slurry are not uniformly mixed. In addition, the low surface roughness means that the particles of the mixture constituting the slurry are relatively small, which means that the additives including the raw powder contained in the slurry are uniformly mixed. That is, the slurry produced through the method for producing a slurry for a solid oxide fuel cell of the present invention may improve the performance of an electrode employing the same and a battery including the same. Specifically, this may be described in detail with reference to the following embodiments and drawings.

Hereinafter, preferred examples are provided to aid the understanding of the present invention. However, the following experimental example is only for helping understanding of the present invention, and the present invention is not limited by the following experimental example.

<Example>

Example 1 Preparation of Slurry Using Resonant Acoustic Mixing (3 Mixing Processes)

Hypermercadi-based dispersant (Hypermer KD-1) was added to a solvent mixed with ethanol and toluene, and mixed with an acceleration of 80 G for about 3 minutes using a resonance acoustic mixer. Mixing powder containing nickel oxide (NiO) and yttria stabilized zirconia (TZ-8Y) and raw powder containing pore-forming agent PMMA (SUNPMMA-S50C) at 80G acceleration for 5 minutes using a resonance acoustic mixer It was.

The mixed raw material powder was added to the solvent containing the mixed dispersant, zirconia balls were further added, and mixed for about 5 minutes at 80 G acceleration using a resonance sound mixer to form a first mixture (first Mixing process). PVB (PVB 79) as a binder was added to the first mixture, followed by mixing for about 3 minutes at 80 G acceleration using a resonance acoustic mixer (second mixing process). After adding DBP as a plasticizer to the second mixture, the mixture was mixed at 80 G acceleration for about 3 minutes to prepare a slurry (third mixing process). Zirconia balls were removed from the prepared slurry and degassed for about 1 minute.

Example 2 Preparation of Slurry Using Resonant Acoustic Mixing (One Mixing Process)

Hypermercadi-based dispersant (Hypermer KD-1) and a plasticizer DBP were added to a solvent mixed with ethanol and toluene and mixed with an acceleration of 80G for about 3 minutes using a resonance acoustic mixer. Resonant sound after adding zirconia ball and raw material powder and binder including PMO (SUNPMMA-S50C), a powder mixed with nickel oxide (NiO) and yttria stabilized zirconia (TZ-8Y) Using a mixer, the mixture was mixed at an acceleration of 80 G for 5 minutes.

After the mixture of the raw material powder and PVB was added to a solvent in which the dispersant and DBP were mixed, the mixture was mixed for about 10 minutes at 80 G acceleration using a resonance acoustic mixer to prepare a slurry. Zirconia balls were removed from the prepared slurry and degassed for about 1 minute.

Example 3 Preparation of Slurry Using Resonant Acoustic Mixing (Two Mixing Processes)

In Example 1, the process of mixing the solvent and the raw material powder including the dispersant was performed in the same manner.

The mixed raw material powder and zirconia ball were added to the solvent in which the dispersant was mixed, and then mixed with the resonant acoustic mixer for about 5 minutes at 80 G acceleration to form a first mixture. After adding PVB and DBP to the first mixture, it was mixed for about 10 minutes at 80G acceleration using a resonance sound mixer to prepare a slurry. Zirconia balls were removed from the prepared slurry and degassed for about 1 minute.

Comparative Example 1: Preparation of Slurry by Ball Milling

Zr ball is added to a mixture containing nickel oxide and yttria stabilized zirconia, a raw material powder containing PMMA, and a mixture of a hypermercadic dispersant in a solvent containing ethanol and toluene, and then Mixing for 24 hours by ball milling to form the first mixture. The slurry was prepared by adding PVB and DBP to the first mixture for 24 hours by ball milling. Zirconia balls were removed from the prepared slurry and degassed for about 24 hours.

2A to 2C are images of the slurry prepared in Examples 1, 2, and 3 according to one embodiment of the present invention, dried after tape casting, and observed by observing the tape surface.

Figure 2a relates to the slurry prepared in Example 1 of the present invention, hardly agglomeration phenomenon appeared on the surface of the tape, it was confirmed that the surface roughness is visually low. Figure 2b relates to the slurry prepared in Example 2 of the present invention, did not appear large aggregation on the surface of the tape, it was confirmed that the surface roughness is visually high. Figure 2c relates to the slurry prepared in Example 3 of the present invention, it can be seen that the agglomeration occurred in the tape surface. That is, the slurry produced in the embodiment of the present invention through Figures 2a to 2c it can be seen that greatly improved the agglomeration phenomenon occurred during the tape casting.

In addition, as disclosed in Example 1 of the present invention, a binder is added to the mixture of the raw material powder and the solvent including the dispersant and the mixture of the raw material powder and the solvent including the dispersant to add the mixture and the raw material powder, Example 2 and the case where the mixing process was performed by adding a solvent containing a dispersant and a mixed plasticizer mixed with the binder and mixing, that is, the mixing process was separated by sequentially adding the components constituting the slurry. It can be seen that the agglomeration phenomenon can be improved and the surface roughness of the slurry can be lowered than when the slurry is prepared by the mixing process of one or two disclosed in Example 3. As described above, it is expected that the quality and efficiency of the battery employing the prepared slurry through the method for producing a slurry for a solid oxide fuel cell of the present invention can be greatly improved.

3 is a SEM image showing the surface of the slurry prepared in Comparative Example 1 and Example 1 of the present invention by attaching to the surface of the tape to observe the surface with a scanning electron microscope.

Referring to FIG. 3, it can be seen that the slurry prepared in Comparative Example 1 of FIG. 3 (a) includes a large amount of aggregated particles. On the other hand, the slurry prepared in Example 1 of Figure 3 (b) can be seen that there is no aggregated particles. That is, the slurry prepared in Example 1 of the present invention is crushed and dispersed as compared to the slurry prepared in Comparative Example 1, which was performed using the conventional ball milling process as the mixing process was performed using resonance acoustic mixing. As this is done better, it is judged that uniform mixing is performed without aggregated particles. Through this, it can be seen that the method for producing a slurry for a solid oxide fuel cell of the present invention can increase the crushing and dispersibility as well as shortening the manufacturing process time by mixing using resonance acoustic mixing.

4 is a SEM image showing the surface of the slurry prepared in Comparative Examples 1 and 4 of the present invention by scanning electron microscope.

Referring to Figure 4, it can be seen that the dispersion degree of the surface of the slurry prepared by the resonance acoustic mixing method in Example 4 of the present invention is better than the surface of the slurry of Comparative Example 1 prepared by mixing by ball milling.

Specifically, as the slurry prepared in Example 4 of the present invention is mixed using resonant acoustic mixing, the pulverization of the mixture of the raw material powder and the solvent including the dispersant is better performed, thereby obtaining relatively small particles. It is to be formed, it is determined that the surface area will be wider than the binder and plasticizer added in Comparative Example 1 was prepared by adding more binder and plasticizer by 4 to 6g each. That is, although the slurry of Example 4 of the present invention contained more binders and plasticizers than the slurry of Comparative Example 1, it was found that the mixture had a uniform surface with almost no large particles and aggregated particles by mixing using resonance acoustic mixing. Can be.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

Claims (8)

Preparing a slurry by mixing a raw powder, a solvent including a dispersant, a binder, and a plasticizer,
The mixing process is characterized in that performed using the resonance acoustic mixing,
The mixing step,
A first mixing step of mixing the raw material powder and the solvent including the dispersant by using resonance acoustic mixing to form a first mixture;
A second mixing step of adding the binder to the first mixture and then mixing using resonance acoustic mixing to form a second mixture; And
And a third mixing step of adding the plasticizer to the second mixture, followed by mixing using resonance acoustic mixing to form the slurry.
Slurry for solid oxide fuel cell, characterized in that it further comprises the step of mixing by adding a grinding ball (ball) to at least one of the mixing step of the first mixing step, the second mixing step and the third mixing step. Manufacturing method. The method of claim 1,
The raw material powder is a metal containing at least one oxide powder selected from zirconia (Zr), ceria (Ce), lanthanum (La) magnesite (Mn) and bismuth (Bi) system, nickel (Ni) oxide Method for producing a slurry for a solid oxide fuel cell, characterized in that it comprises an oxide powder and a pore former. The method of claim 1,
Before carrying out the mixing process,
The method of preparing a slurry for a solid oxide fuel cell, characterized in that it further comprises the step of preparing a mixture containing the raw material powder and the dispersant by using a resonance acoustic mixing. delete delete The method of claim 1,
The resonance acoustic mixing is a method for producing a slurry for a solid oxide fuel cell, characterized in that to perform a mixing process at an acceleration of 60 to 80 G. The method of claim 1,
The resonance acoustic mixing is a method for producing a slurry for a solid oxide fuel cell, characterized in that to perform a mixing process for a time of 3 to 60 minutes. Slurry for solid oxide fuel cells, characterized in that produced by the method for producing a slurry for solid oxide fuel cells of claim 1.

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